Re: Question about spirometery test
A challenge test is a Methacholine challenge test. Its where a dr monitors your breathing, measures it on room air, then gives you certain amounts of methacholine, which will induce an asthma attack. They take measurements of your breathing after each dose, and if theres a change before a certain amount (my drs office does 5 doses, up to 18% methacholine) they say its positive for asthma and give you a breathing treatment immediately.
If you go through all the stages without change in your breathing then its considered negative for asthma, they give you a breathing treatment at the end anyways.
Miine took about an hour and a half because I ended up testing negative, and each level of methacholine takes like 5 to 10 minutes to do, so its a lengthy process but everyone says its the best way to tell if you have asthma or if its something else (in my case its anxiety, grrr).